Description
The pseudogap in the cuprate high-temperature
superconductors was discovered as a suppression of the
Knight shift and spin relaxation time measured in nuclear
magnetic resonance (NMR) experiments. However, theoretical
understanding of this suppression in terms of the magnetic
susceptiblility of correlated itinerant fermion systems was so
far lacking. We will present results of a study of the
temperature and doping evolution of these quantities on the
two-dimensional Hubbard model using cluster dynamical
mean field theory. We recover the suppression of the Knight
shift and the linear-in-T spin echo decay that increases with
doping. The relaxation rate shows a marked increase as T is
lowered but no indication of a pseudogap on the Cu site, and
a clear downturn on the O site, consistent with experimental
results on single layer materials but different from double
layer materials. The consistency of these results with
experiment suggests that the pseudogap is well described by
strong short-range correlation effects.
